2019 year born – age now in 2023?

How old am I in 2023 if I was born in 2019? Today's date is - 7 December 2023.

If year of birth - 2019, he is now:
3 years old or 4 years old*

*Depends on before or after 7 December 2019 year he was born.

If a person was born from January 1 2019 to 7 December 2019 inclusively, he is 4 years old now, otherwise, if after 7 December 2019 (until December 31 2019 inclusively), then he is still 3 years old now.

Other examples:

If 1904 year of birth - already 119 years or still 118 years.
If 1974 year of birth - already 49 years or still 48 years.
If 1981 year of birth - already 42 years or still 41 years.
If 2003 year of birth - already 20 years or still 19 years.

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